The area of Sing Buri held an important position in early Thai history from the Dvaravati period down to the Ayutthaya period. Formerly the province was separated into three small provinces, In Buri, Prom Buri, and Sing Buri, which were unified by King Chulalongkorn (Rama V) in 1895.[1]

Seal of the fort of Khai Bangrachan, the old seal of Sing Buri Province

Seal of the Monument of eleven leaders of Khai Bangrachan, the seal of Sing Buri Province since 2004.[2]

The provincial seal shows the fort of Khai Bangrachan, a historical monument. When the Burmese attacked Ayutthaya in 1765, 11 villagers from Bangrachan fought the army when it stopped north of Ayutthaya. They managed to delay them for five months before they were finally defeated, soon thereafter Ayutthaya fell as well. Annually on 4 February a ceremony is held in remembrance of these local heroes. This story was also made into a movie in Thailand.